The majority of MPs agreed that sexual infidelity, sexual jealousy or envy ought not count as a "qualifying trigger" allowing a partial defence against a charge of murder on the grounds of "loss of control".
Government minister, Clare Ward, explained there was a need to make this explicit in the act as some courts had found sexual infidelity was a sufficient provocation to allow murder to be reduced to manslaughter and it the government found this unacceptable.[1] Conservative opposition members Ann Widdecombe and Dominic Grieve argued the decision should be left to juries.[2]

The House of Lords had made amendment 55 which was to leave out amendment section (c) completely. [2]
The original section (c), which the Lords had wanted to leave out of the bill completely stated:

The fact that a thing done or said constituted sexual infidelity is to be disregarded.

All Liberal Democrats, with the exception of Mike Hancock MP, abstained from the vote. Liberal Democrat David Howarth, MP for Cambridge, had tabled the following amendment in lieu of the Lords' amendment[3]:—
(a) Page 29, line 19, leave out paragraph (c) and insert—

‘(c) where D acted principally out of a desire to punish V for any act, whether by V or by any other person, which D perceived at the time to amount to sexual infidelity, or where D acted principally out of sexual jealousy or envy, the circumstances shall not constitute “circumstances of an extremely grave character” for the purposes of subsection (4)(a).’.

It appears the Liberal Democrats abstained because they wanted an outcome not in line with either of the options on offer.

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